Triple preheater for boilers



o. GARRAWAY TRIPLE PREHEATER FOR BOIL RS Oct. 2, 1928.

Filed Oct. 1, 1924 gvwsmto'a 2 Sheets-Sheet Z. O. Gar/'a'wa y L. o.GARRAWAY TRIPLE PREHEATER FOR BOILERS Filed Oct. 1, 1924 2 Sheets-Sheet2 L. Garrawa'y Oct. 2 1928.

o I VIIIIIIYIIII I Patented Oct. 2, 1928.

ceerse stars LEE 0. GARE-AWAY, or MEMPHIS, r'nivnnssnn,

trnrrnn PREHEATEIBI ron BOILERS.

' Application med October 1,71924. Serial No. 741 ,073.

pump, and on its way to said device the ex haust steam is made to giveup heat to the incoming feed water. This feed water is also heated bythe shell or" the boiler against which vthe water conduit is laid andlastly before entering the boiler the wateris conducted by the conduitthrough a heating flue within the boiler vbefore finally entering; thelatter. i

In the accompanying drawings, one em- I I I I this manner preservingtheheat as much as possible in the casing. The p1pe24 contrnbodiment of theinvention is illustrated,'and Figure 1' is a sideelevation of alocomotive in partial section; I v Fig. 2 is a section on the line 22 ofFig.

of the heating box or casing through which the feed pipe passes;

Fig. 3, is a section on the line -3 0t Fig, 1, and

F 1g. 4: is a section on the line 4::I4IO' Fig. 1;

[F 5, is a detail sectionof a double check valve which is employed; Fig.6 is a detail sectionon the line 66 ofFigtli, i In the drawings, thereference numeral it) represents a locomotive of any modern type. Theexhaust steam is led from the exhaust nozzle 11 by a pipe 12 whichextends upwardly in the smoke box'SO to the shell of which is secured inany approved manner. An opening 40 is provided in the smoke box 30 forthe exhaust pipe 12 which opens into a casing 13 which extends along theshell 25 of the boiler. This casingis open on its side nearest the shell25 of the boiler and is attached in any suitable manner, as by bolts 14,

to the latter so as to form a steamtight connection therewith. At therear end of the V casing is formed a .pocket 15 from which a pipe 16 isadapted to conduct the steam from the casing to aninjector 1'Z'. Theinjector shown conventionally on the drawings is of the lifting type,but it is evident that-any other device, such as a pump, may be usedposed in the exhaust steam pipe 16-.

for feeding the water into the boiler. The injectorfhas the usual livesteam intalrej18, overflow pipe 35 anda cold-teed Waterpipe 19 with theusual valve 20 for admittingthe' water to the injector, and a valveQl'is dis- I This valve 21 is open when the injector is in oper' ationin 0rd at to admit exhaust steam and c'on densate i romfthe heater 18into the injector I adjacent the outlet thereof. @When the latter is notworking, the valve 21 is lrept closed'to prevent exhaust steam andcondensate lro'm entering the injector.

' The reference numeral 22 represents'a pipe provided withthe usualboiler check valve 23. This pipe leads from the outlet of the in ectorand proceeds, asat- 24:, through the casing'18, I The casing is veryshallomas I best seen in lligure 3, so thatthe portion2 1 the pipe Wlllhe close against the shell 25 ot' the boiler. The casing;isinserte'd-under anasbestos lining 16 ands jacket 47 which I usuallycover the exterior. of the boiler, in

ues to the -forward end of the casing where it makes ashort loop andruns'out from the casmg in a' downward dire'ctionto a double" 'bOlll"check valve 26.

30 in the usual manner. The pipe then contumors in an outward directionthrough the shell oat-the smoke box 30, as at 32, and terminates with anintake 31 on'the side of the vboiler and communicating with the Water IIt will now be evident that the -teed water after leaving the in ectorspace of the same.

passes through the casing 13, thence proceedfore enteringthe boiler at31. l/Vhile the check valve 26 in itself forms no part of my inventionand maybe of anyknown-or approved construction, I have shown in Figs. 1The 5and 6 a valve which I prefer to use. valve casing 50 is rigidlysecured upon the boiler shell and s provided 111 lts upper part with aport 51 alininq' with a passage through the boiler shell whereby toestablish communication with the Wat'er space of the boiler. At itsouter end, the port 51 opens into a chamber 52 in the valve casing andin the bottom of said chamber is a, downwardly flared port 53 forming aseat for the upper end of the double valve body 54 which is'of circularcross section and tapered from its middle to both ends, and is freelymovable-between the ported bottom of the chamberbQ and a web 55 forminga partition between the pipes 24 and 27. An upwardly flared port 56 inthe partition in vertical alinement with the port 53 forms a seat forthe lower end of the valve lVlien' the injector is-working, the waterforced through thepipe 24 lifts thevalve 54 to the seat 58 and therebycuts off flow through the port 51 from the boiler, and it will beevident that the feed water is forced through the pipes 27 and 37 intothe boiler at the intake 31 Vhen the injector is not working, the valveseats in the port 56 and local water circulation thentakes place fromthe water space of the boiler through the pipes Q'Tand 8 7 into theboiler through the intake 31, burning of the'pipes being therebyavoided.

The exhaust steam before leaving the easing 13 is made to pass throughoil separators 3iplaced upon ledges 33 in the pocket 15.

The operation of the device is as follows.

I The exhaust steam is taken through the pipe 12 into the casing 13 and,when the injector is inoperation, passes through the oil separatin dei'ice'sin the pocket 15 and continues purified through the pipe 16 intothe injector 17 where it condenses when meeting the water passingthrough the injector, the feed water being thereby heated and thecondens sate being comminglejd with the water to again pass through thesystem. This forms the first heating stage. Thispartly heated water isthen forced through the check valve 23 and the pipe 22. Upon enteringthe easing 13 through the pipe 2%, the preliminarily heated water willbe further heated by the exhaust steam freely circulating around thepipe and by the heat rising from the boiler shell.

This accordingly forms the second stage of theheater. The thus heatedwater v then passes through the downward continua shell of the boiler,then into the smoke box of the boiler, then back and forth within aboiler flue and thence into the frontendof the boiler, a casing upon theboiler shell housing the portion of the water conduit lying on saidshell, a pipe extending from I the steam exhaust of the locomotiveengine's through the smoke box into the front end of said casing, andmeans for conveying ex hauststeam from the rear end of the Cas ing anddelivering it into the water conduit I at the source of supply in rearof the casing;

2. A feed water heater system for income tires consisting of acontinuous water con duit extendinglongitudinally upon the shell of thelocomotive boiler to a point near the front end thereof, then downwardlyto a point on. theside of the locomotive smoke box and then back andforth. within the smoke box and a flue of the boiler, the t'er-' minalof said conduit entering the boiler, a heat insulated casing securedupon the shell of the boiler over the longitudinalportion of the waterconduit resting thereon, pipe rising from the exhaust steam outlet ofthe locomotive engine through the smoke box into the front end of thecasing, a pocket at therear end of the casing, a water-forcing device tothe rear of the casing, and a pipe leading exhaust steam from the pocketof the casin into the water-forcing device at the '3 water outletpassage ofthe same.

In testimony whereof I aflix mysignature.

LEE 0. GARRAWAY. [L. s.-]

